On Wednesday, 16 December 2015 at 15:44:45 UTC, Andrei
Alexandrescu wrote:
This has been discussed in the past and at a point Walter was
looking into it.
Currently std.conv.to applied to double uses snprintf, which is
obviously non-CTFEable.
There's been recent work (also discussed here) on fast accurate
printing of floating point values, see library
"double-conversion" written in C++ and the associated paper
http://www.cs.tufts.edu/~nr/cs257/archive/florian-loitsch/printf.pdf.
Implementing that in D would be awesome because there are many
many applications of CTFEing doubles converted to text.
Andrei
If the purpose is to make it CTFEable, then we need to make it
work at first. So, there
is no need to focus on fast accurate implementation. I will try
to implement it by
multiplication and modulus operations at compile time. But I am
not sure about how long the decimal part (I don't know what the
part after point is called) should be. Would it be acceptable if
it becomes 100 digits in string? What is the limit?
